三唑酮和苯醚甲环唑在草莓及土壤中残留消解动态

采用田间试验的方式,对三唑酮及苯醚甲环唑在草莓及土壤中降解、残留情况进行研究。结果表明,2种农药的降解符合一级动力学方程,苯醚甲环唑在草莓果实、茎叶、土壤中的半衰期分别为4.09、8.21、13.38 d;三唑酮在草莓果实、茎叶、土壤中的半衰期分别为3.38、5.31、15.64 d。建议草莓中苯醚甲环唑的最大残留量(maximum residue limit,简称MRL)为0.5 mg/kg,10%苯醚甲环唑水分散剂、20%三唑酮乳油分别按照100、60 g a.i./hm^2剂量施用4次,安全间隔期为7 d。

Degradation Dynamics of Triadimefon and Difenoconazole Residues in Strawberry and Soil

A field experiment was employed to study the degradation of triadimefon and difenoconazole residues in strawberry and soil. The results showed that the degradation of both the two kinds of pesticides was in accordance with the first order kinetic equation. The half-lives of difenoconazole in strawberry fruit, strawberry stem leaf and soil were 4.09, 8.21 and 13.38 d, respectively; and the half-lives of triadimefon in strawberry fruit, strawberry stem and leaf and soil were 3.38, 5.31 and 15.64 d, respectively. The maximum residue limit （MRL） of difenoconazole in strawberry was recommended as 0.5 mg/kg, and 10% difenoconazole WG and 20% triadimefon EC should be applied four times with a safety interval of 7 d according to the amounts of 100 and 60 g a. i./hm2,respectively.